c语言中用递归法求X的平方根的问题

#include "stdio。h"double mysqrt(double a,double x0){double x1;x1=(x0+a/x0)/2。0;if(fabs(x1-x0)>0。0000000000001) return mysqrt(a,x1);else return x1;}int main(){double x;scanf("%lf",&x);printf("The sqrt of %f=%f\n",x,mysqrt(x,1。0));return 0;}